Xorg hardware auto-setting chooses sometimes wrong defaults for your GPU. Here are the basics to overcome some common troubles with AMD GPUs using the open-source radeon driver (package "xserver-xorg-video-radeon"). Depending on your actual GPU model, some options may have different default values and/or options may have no effect at all.

The script will output the new profile you just chose and if you don't pass any parameter, the command will return its usage syntax instead.

The "dynamic" (dyn param) power method is the most efficient performance/powersaving mix but the less compatible with special configs. The "low" option of the "profile" power method is the most efficient powersaving mode, at the expense of performance. None of these two modes is the default running state (default is "auto") of the radeon driver, so users complaining of overheating should try one of these two modes. For example, on my HD6770 I get these average temperatures in common desktop use: